require('./main.css')
const { toLowerCase } = require('./b.js')
const a = "Hello 严辰？?"
console.log(toLowerCase(a));
// console.log(toUperCase(a));
let divv = document.createElement('div')
divv.textContent = '严总真帅';
document.body.appendChild(
    divv
)
module.exports = a; // Common js 模块化方案